﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WeChat.API.Tools
{
    /***
    * ===========================================================
    * 创建人：yuanj
    * 创建时间：2018/01/17 13:07:09
    * 说明：
    * ==========================================================
    * */
    public class StringUtils
    {
        ///   <summary>      
        ///   将指定字符串按指定长度进行剪切，      
        ///   </summary>      
        ///   <param   name= "oldStr "> 需要截断的字符串 </param>      
        ///   <param   name= "maxLength "> 字符串的最大长度 </param>      
        ///   <param   name= "endWith "> 超过长度的后缀 </param>      
        ///   <returns> 如果超过长度，返回截断后的新字符串加上后缀，否则，返回原字符串 </returns>      
        public static string StringTruncat(string oldStr, int maxLength, string endWith)
        {
            if (string.IsNullOrEmpty(oldStr))
                //   throw   new   NullReferenceException( "原字符串不能为空 ");      
                return oldStr + endWith;
            if (maxLength < 1)
                throw new Exception("返回的字符串长度必须大于[0] ");
            if (oldStr.Length > maxLength)
            {
                string strTmp = oldStr.Substring(0, maxLength);
                if (string.IsNullOrEmpty(endWith))
                    return strTmp;
                else
                    return strTmp + endWith;
            }
            return oldStr;
        }

        public static string GetSeq(string str)
        {
            if (string.IsNullOrEmpty(str))
                return "";
            int begin= str.IndexOf("=")+1;
            int end = str.IndexOf("&");
            return str.Substring(begin, end- begin);
        }


    }
}
